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Shanu arora
solution :for z=0 ,residue is -4/9 and for z=3 it's 4/9 , thus ths sum is 0 . but I think in question there must be a boundary or region must have been given for which the point z=3 is outside that region and thus z=3 will not be considered to calculate if it lies outside the concerned region.otherwise if no region is given then your ans 0 is correct.